Air-cooled brake shoe



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C. C. EURIT AIR-COOLED BRAKE SHOE'y Filed Jan. 25, 1945 ams,

Patented Aug. 20, 1946 Y UNITED sTATEs PATENT OFFICE AIR-COOLED BRAKE SHOE Carl C. Eurit, Tulsa, Okla.

Application January 23, 1945, Serial No. 574,117

4 Claims.

This invention relates to brake shoes and has special reference to a brake shoe adapted for use on railroad cars and the like.

One important object of the invention is to provide an improved form of brake shoe having Ventilating means whereby, during application of the brake, the shoe will be prevented from becoming excessively hot.

In the type of brake shoes forming the subject matter of this application it is quite common to use cast iron in their manufacture. When these shoes are applied and become over-heated the braking surface of the shoe frequently glazes with the consequence that the braking effect is greatly diminished.

A second important object of the invention is to provide a novel form of brake shoe wherein over-heating and consequent glazing will be prevented.

A third important object of the invention is to provide a self-cooling brake shoe having means for gathering a current of air and directing it inwardly across the shoe.

With the above and other objects in View the invention consists in certain novel details of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawing, and particularly claimed.

In the accompanying drawing, like characters of reference indicate like parts in the several views and:

Figure 1 is a side elevation of a brake shoe constructed in accordance with this invention.

Figure 2 is an elevation from the convex side of such a shoe.

Figure 3 is a fragmentary section on the line 3 3 of Figure 2.

Figure 4 is a section on the line 4`4 of Figure 2.

The brake shoe as here shown is intended for use with a brake head I-I, indicated in broken lines, of the type adopted by the Master Car Builders Association and known as an M. B. C. brake head. The shoe therefore has an arcuate body I having a concave face II for engaging the rim of a wheel W shown by broken lines in Figure 4, and a convex face I2 engaging the brake head. The convex side of the shoe is provided with the usual transverse rib or boss I3 centrally of its height for engagement with the appropriate portion of the brake head and also with terminal ribs I4 for like purposes. At each side of the body I there is provided an airgathering baille I5 which is carried to the body side by a plurality of ribs I6 at the center and ends of the respective sides.

(Cl. 18S-264) This arrangement is such that the baffles I5 extend substantially half way down the thickness of the brake shoe from the convex toward the concave side and extend backward to the concave side to embrace the sides of the brake head H when applied thereto. These bailles incline from their forward edges inwardly to a point opposite the convex face of the shoe and then continue to extend inwardly through curved portions as clearly shown in Figure 4. This makes an air duct between each baifle and the respective side of the shoe, the said air duct being wider at its mouth or receiving end and narrower at its rear end. Also the convex face of the brake shoe is provided along the central line at each side of the rib I3 with a plurality of concave grooves Il arranged in plan to form X-shaped gures with adjacent arms of the figures connected. Furthermore, grooves I8 extend from the arms of the X-shaped figures outwardly to open into the channels formed by the bai'lies. At the end of each arm of these figures and also at the center of each X-shaped figure there is provided a vent opening I9 which extends from the convex to the concave face of the shoe and which tapers throughout its length so that it is smaller at the concave side than at the convex side.

By means of this arrangement air can flow through the channel formed by the baffles and since brake shoes never fit closely on brake heads, can work its way between the heads and shoe into the openings I9 thus cooling the shoe. Furthermore by means of the bailles I5 heat radiating ns are provided and likewise all the openings I9 add to the heat radiating surface. It will now be plain from this construction that the brake shoe will be efectively cooled and, since the shoe is kept cooled, no glazing of the braking face of the shoe wil occur.

What is claimed is:

1. A brake shoe having a body provided with a series of Ventilating perforations, and air gathering baflles extending along and spaced from the sides of said body.

2. A brake shoe having a body curved to provide opposite convex and concave faces, said body having Ventilating perforations extending therethrough between said faces, and air gathering bales extending along and spaced from the sides of said body.

3. A brake shoe having a body curved to provide opposite convex and concave faces, said body having Ventilating perforations extending therethrough between said faces, said body having 3 channels connecting adjacent perforations, and air gathering baffles extending along and spaced from the sides of said body.

4. A brake shoe having a body curved to provide opposite convex and concave faces, said body having Ventilating perforations extending therethrough between said faces, said body having channels connecting adjacent perforations, said body having the convex face provided With grooves connecting adjacent perforatons, and air gathering bales extending along and spaced 5 from the sides of said body.

CARL C. EURIT. 

